Nut-lock.



Fig. 2 is a longitudinal section.

NITED TATES JOSEPH A. NICKERSON, OF

BOSTON, MASSACHUSETTS.

NUT-LOCK.

SPECIFICATION forming part of Letters Patent No. 643,615, dated February 13, 1900.

Application filed December 19 To alt whom it may concern:

Be it known that I, JOSEPH AINICKERSON, of" Boston, (Roxbury,) in the county of Suffolk, State of Massachusetts, have invented certain new and effici'ent Improvements'in Nut-Locks, of which the following is a specification. 4

This invention relates to nut-locks; and it has for its object to attain an association of its parts, so that when the parts are located in their respective engagement with each other the same will remain as positioned in an efficient manner until disengaged by hand,

' which I attain in the following mannerthat is to say, when the nut-lock is inuse.

Figure 1 is a side view of my invention.

Fig. 3 isa transverse section'of Fig. 2, looking in the di'-' r'ection denotedby the arrow.

A represents the bolt, a its head, and 0, its shank or stem. The free end of the bolt-stem for a distance of its lengthis threaded with a right-hand thread and with a left-hand thread on the same part of the stem, as denoted by the letter M, so as to permit a' right-handthreaded nut to be screwed on the bolt-stem and alsoa left-hand threaded nut tobe screwed on said stem.

B denotes a right-hand-threaded nut, the threads of which efficiently mesh with the corresponding threads on the bolt-stein. The longitudinal outer surface of this nut is provided with right-hand threads, (represented byb.) b denotes the internal threads of said nut.

'0 represents a check-nut which is provided with left-handed threads (denoted by the letter a) that engage-corresponding threads on the bolt-stem.

D denotes a binding cap-nut which is provided with internal righthanded threads (represented by the letter (Z) thaten gage with the corresponding external threads provided on the right-hand-threaded nut. This cap-nut is provided with the internal space (1', the diameter of which is greater than the outside points of the check-nut, (clearly illustrated in Fig. 3,) andisalso provided with the shoulder (1 the function of which is to contact the outer vertical surface of the check-nut, as

shown in Fig. 2. The head of the cap-nut d ,1899. Serial-No. 740,920. (No model.)

and nut to draw firmly and rigidly together iron plates and the like and to hold them together as set by the bolt and nut, and at the same time to have the bolt and nut so engaging each other that the bolt or nut through vibration will not allow the plates held by'the bolt and nut to become loose. To accomplish this end,various means and devices have been employed, particular attention being given to lockthe nut contacting the plate in the position set. This invention accomplishes two essential mechanical locking elements in a nut-lock and bolt among other elements, which will be hereinafter pointed out-namely, that the material or plate contacting nutis eificiently locked, and also the bolt is locked in such a manner that it cannot be eventurned by hand or otherwise. The bolt is passed through the plates. The

right-hand-threaded nut is screwed on the stem and brought home hard against the face of the plate, bringing both-plates firmlytodirectioncapable of becoming loose is checkedby the left-handed nut, that is made to turn, due to both nuts being up hard against each other, in the direction drawing said not far-' ther on the bolt-stem,andconsequently harder against the rightjhand threaded nut; "but there is' nothing so anto prevent the bolt turningjor the left-hand-threaded nut work- -ing free. These two points or defects are overcome by the cap-nut, which, after the has the opening (1 therethrough, the diameter aforesaid nuts have been positioned, as be-- fore described, isserewed on the plate-contacting nut which has right-handed threads,

thus requiring the cap-nut to be screwed on the nut in a right-handed direction until it is brought home hard against the-outer vertical surface of the eheck-nut-or left-handed nut. This cap-nut prevents any possible movement The movement to free reetion,which would increase the force against the cap-shoulder and tend to draw the-capnut farther on the vplate-contacting nut, thus increasing the lockingeleu ent. Further, this cap-nut prevents the bolt turning by staying any movement of the check-nut. In other words, the same force that would tend to free the bolt and nut parts would at the same time establish a greater locking force of the said parts. To insure against any possible freeing of the cap-nut from its engaging nut,'theend of the cap-nut may be slightly squatted on the said engaging nut, so as to fill a small cavity or groove provided on the engaging nut, (represented by Z2 When removing the cap-nut, the threads thereon will resume or be forced back to theiroriginal form.

I wish it to be understood that I am aware that a bolt having right and .left handed threads thereon, as described in this application, and right and left handed nuts designed to engage said bolt and each other have been heretofore used to attain the end sought by this invention and that I do not claim the same broadly; but

What I do claim as my invention, and desire to secure by Letters Patent, is-

The combination of a bolt having right and left crossing threads on its; stem, a nut having right-hand threads to engage corresponding threads on the bolt-stein,- and having right-hand threads on its outer surface to engage a cap-nut, ache'ck-nut having lefthand threads to'en'gage corresponding threads on the bolt-stem, a cap-nut having threads to engage the external threads on the right-handthreaded nut, and having a shoulder to en gage the outer vertical side of the check-nut, and anopening therethrough in diameter greater than the diameter of the bolt-stem, and being designed to not contact the checknut other than the vertical wallof said checknut before mentioned, substantially as described.

y In testimony whereof I have hereunto set my hand to this application this 15th day of December, A. 111899.

JOSEPH A. NICKERSON.

Witnesses:

'lnos. WILLIAM HOBDAY, EDWARD F. IIoLLIs. 

